Final answer:
The sign that most likely indicates that drivers are allowed to turn left from either lane is a dual left turn lane sign with two left-turn arrows, one for each lane.
Step-by-step explanation:
If drivers are allowed to turn left from either lane, the sign that most likely indicates this would be a sign with two left-turn arrows, one for each lane.
This sign is commonly known as a dual left turn lane sign. It helps drivers know that they can turn left from either lane.